/Engine/Source/Runtime/Core/Public/Templates/Invoke.h
Trait for the type of the result when invoking a callable with the given argument types. Not defined (and thus usable in SFINAE contexts) when the callable cannot be invoked with the given argument types.
template<typename FuncType, typename... ArgTypes> struct TInvokeResult : public [UE::Core::Private::TInvokeResult_Impl< void, FuncType, ArgTypes... >](API\Runtime\Core\Templates\TInvokeResult_Impl)